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[POWERPC] Introduce lowmem_end_addr to distinguish from total_lowmem

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total_lowmem represents the amount of low memory, not the physical
address that low memory ends at.  If the start of memory is at 0 it
happens that total_lowmem can be used as both the size and the address
that lowmem ends at (or more specifically one byte beyond the end).

To make the code a bit more clear and deal with the case when the start of
memory isn't at physical 0, we introduce lowmem_end_addr that represents
one byte beyond the last physical address in the lowmem region.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Kumar Gala
2008-04-16 05:52:22 +10:00
committed by Paul Mackerras
parent 99c62dd773
commit d7917ba705
5 changed files with 16 additions and 9 deletions
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4
arch/powerpc/mm/init_32.c
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@@ -146,6 +146,7 @@ void __init MMU_init(void)
}
total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr;
lowmem_end_addr = memstart_addr + total_lowmem;
#ifdef CONFIG_FSL_BOOKE
/* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
@@ -156,9 +157,10 @@ void __init MMU_init(void)
if (total_lowmem > __max_low_memory) {
total_lowmem = __max_low_memory;
lowmem_end_addr = memstart_addr + total_lowmem;
#ifndef CONFIG_HIGHMEM
total_memory = total_lowmem;
lmb_enforce_memory_limit(total_lowmem);
lmb_enforce_memory_limit(lowmem_end_addr);
lmb_analyze();
#endif /* CONFIG_HIGHMEM */
}